I have a fairly default Fedora 7 installation, certainly the sendmail is just as it was installed.
How do I get sendmail to deliver mail to local destinations? The system's hostname is home.isbd.net and it's connected to the Internet via a router. I have a CNAME set up at the hosting provider that hosts isbd.net to point at the static address of my ADSL connection.
When I send mail from my system to a local address it gets the hostname added, thus mail gets sent to root@home.isbd.net, postmaster@home.isbd.net, chris@home.isbd.net, etc. All of this fails because sendmail attempts to connect to the SMTP port of home.isbd.net, which isn't possible because my router's firewall doesn't accept connections on port 25.
I don't want to open up port 25 and it seems a bit silly anyway to send mail on such a long round trip. Is there any way I can tell sendmail that home.isbd.net is localhost (or 192.168.1.1)? I have an entry for home.isbd.net in my /etc/hosts file which is:-
192.168.1.1 home home.isbd.net
but obviously sendmail is doing a DNS lookup for home.isbd.net which returns the 'external' IP address.